I started using 'Salatin style' pens for broilers 5 years ago, right after I finished "Omnivore's Dilemma". Before that, I've raised them in static pens.
We butcher them anywhere betwixt 8-16 weeks old, to reach a carcass weight of 4.5-10 (!) lbs. A 10 lb chicken has a higher meat:waste ration (I believe), so if your feed inputs are cheap enough, or your food conversion ratio (FCR) is low enough, or both, it may be cost effective to raise CRX to this weight.
But I don't care, because I love giant chickens! I can feed my family all week on one 10 lb bird. Roasted, salad, sandwiches, soup & stock...Forrest Gump's shrimp company ain't got nothing on us!
I used to hand pluck, and that was fine, then I built a Whizbang Chicken Plucker from a plan book and parts kit I bought from another radical, religious fella (that's a joke, son) over at http://thedeliberateagrarian.blogspot.co... . With the plucker, I saw that I could now scale up, so I can sell the surplus to reduce my per unit cost. (Which is my main goal on the homestead, and my definition of a 'farm': grow enough to feed the folks that work, with a surplus to sell for cash or barter.)
After I learned a couple magic numbers for a good scald, and started using shears*, I can process about a dozen birds an hour. I've outlined my "butchering by the steps" below, but there're tons of online resources for the Show Me State crowd ;)...
Magic numbers: Scald your birds at exactly 145 F, for exactly 90 seconds, dunking to get water in among the feathers. When you can easily pull the wing primaries out, the bird is ready to pluck. Look for skin coming off as a symptom of too hot/too long a scald.
By the steps:
1. hang the birds upside down and slit throats, saving the blood which will congeal quickly. Dry this as a garden amendment.
2. scald by the numbers: Scald your birds at exactly 145 F, for exactly 90 seconds, dunking to get water in among the feathers. When you can easily pull the wing primaries out, the bird is ready to pluck. Look for skin coming off as a symptom of too hot/too long a scald.
3. pluck birds. I run them for a minute at a time, spraying a bit of cold water in the plucker. My plucker gets most feathers off the first time if the scald is correct. sometimes the armpits need a bit of manual pluckin'.
4. Eviscerate: USE SHEARS* to cut off legs and head, put in your stock pot bucket for later cookin'. carefully trim around anus (don't nick and get poop on the meat) and pull slightly out with the intestine attached. Slit skin at neck, then cut neck off as far down as you can. You can rip it off, actually. Then loosen crop and esophagus. Reach into gut cavity, enlarging hole as necessary. Reach way up and get the heart, wiggle your fingers to get the lungs if you're good, and pull all out. Trim away the organs you want and put liver, heart in a bowl of ice water. Gizzards are excellent stewed in Italian dressing. Yeah buddy.
5. QC: squirt with a hose, especially around the lungs. You'll want to get the bird in the ice bath ASAP, so you may want to wait to pull pin feathers etc until after its chilled, and you move your operation to the kitchen.
6. Weigh & Bag: AFter they're chilled, I take them to the kitchen. We do a final check, pat dry, put in a poultry bag I get from a butcher, and weigh. We tag them according to weight and quality (sometimes damage occurs during plucking), then either put them on ice, the fridge or double bag them for the freezer. You can submerge a bagged chicken to push the air out.
7. Aging: the consensus seems to be that a bird's tenderness improves with up to 3 days of aging uncovered in the fridge. I use this for all poultry, especially game birds. I try to encourage air flow in the carcass by putting the bird on a roasting rack in a pan to catch the drips. Sooo dang tasty.
8. Cooking: nothing beats a rub with a lime (then throw it inside the cavity), a shake of garlic salt (we make our own) and a squirt of olive oil.
* Shears: I grew up hunting and fishing. I've been carrying a pocket knife since I was in 6th grade. Our family reunions always included the 'knife hand around', where a young man's credibility was marked by the sturdiness, practicality but especially the sharpness of the knife he carried. I love knives, love to use them and collect them. Butchering chickens, IMO is not the right job for this tool. Sharp shears are safer, faster, more precise, and less likely to cause punctures to intestines, which may result in contaminated meat. And, if you are working fast, and have a lot of birds, you WILL nick yourself. Then you've got an open wound coated with chicken guts and fat. So, invest in good shears, and learn to sharpen them.
The rise of Big Ag and factory farming over the past century has conditioned us to treat food mechanically (as something to be recoded and retooled) vs. biologically. And we don't realize that for all our industrialization and optimization, we're actually getting less yield and less nutrition than natural-based processes can offer.
Joel Salatin is one of the most visible and influential leaders in the organic food and sustainable farming movement. His family owns and manages

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